228004421 has 2 divisors, whose sum is σ = 228004422. Its totient is φ = 228004420.

The previous prime is 228004373. The next prime is 228004453. The reversal of 228004421 is 124400822.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118048225 + 109956196 = 10865^2 + 10486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228004421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228001421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114002210 + 114002211.

It is an arithmetic number, because the mean of its divisors is an integer number (114002211).

Almost surely, 2^228004421 is an apocalyptic number.

It is an amenable number.

228004421 is a deficient number, since it is larger than the sum of its proper divisors (1).

228004421 is an equidigital number, since it uses as much as digits as its factorization.

228004421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 228004421 is about 15099.8152637706. The cubic root of 228004421 is about 610.9154229994.

The spelling of 228004421 in words is "two hundred twenty-eight million, four thousand, four hundred twenty-one".